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net: Allow userns root to control ipv4
[linux-2.6-block.git] / net / ipv6 / ip6_gre.c
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c12b395a 1/*
2 * GRE over IPv6 protocol decoder.
3 *
4 * Authors: Dmitry Kozlov (xeb@mail.ru)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 */
12
13#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
15#include <linux/capability.h>
16#include <linux/module.h>
17#include <linux/types.h>
18#include <linux/kernel.h>
19#include <linux/slab.h>
20#include <linux/uaccess.h>
21#include <linux/skbuff.h>
22#include <linux/netdevice.h>
23#include <linux/in.h>
24#include <linux/tcp.h>
25#include <linux/udp.h>
26#include <linux/if_arp.h>
27#include <linux/mroute.h>
28#include <linux/init.h>
29#include <linux/in6.h>
30#include <linux/inetdevice.h>
31#include <linux/igmp.h>
32#include <linux/netfilter_ipv4.h>
33#include <linux/etherdevice.h>
34#include <linux/if_ether.h>
35#include <linux/hash.h>
36#include <linux/if_tunnel.h>
37#include <linux/ip6_tunnel.h>
38
39#include <net/sock.h>
40#include <net/ip.h>
41#include <net/icmp.h>
42#include <net/protocol.h>
43#include <net/addrconf.h>
44#include <net/arp.h>
45#include <net/checksum.h>
46#include <net/dsfield.h>
47#include <net/inet_ecn.h>
48#include <net/xfrm.h>
49#include <net/net_namespace.h>
50#include <net/netns/generic.h>
51#include <net/rtnetlink.h>
52
53#include <net/ipv6.h>
54#include <net/ip6_fib.h>
55#include <net/ip6_route.h>
56#include <net/ip6_tunnel.h>
57
58
eccc1bb8 59static bool log_ecn_error = true;
60module_param(log_ecn_error, bool, 0644);
61MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
62
c12b395a 63#define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
64#define IPV6_TCLASS_SHIFT 20
65
66#define HASH_SIZE_SHIFT 5
67#define HASH_SIZE (1 << HASH_SIZE_SHIFT)
68
69static int ip6gre_net_id __read_mostly;
70struct ip6gre_net {
71 struct ip6_tnl __rcu *tunnels[4][HASH_SIZE];
72
73 struct net_device *fb_tunnel_dev;
74};
75
76static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
77static int ip6gre_tunnel_init(struct net_device *dev);
78static void ip6gre_tunnel_setup(struct net_device *dev);
79static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
80static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
81
82/* Tunnel hash table */
83
84/*
85 4 hash tables:
86
87 3: (remote,local)
88 2: (remote,*)
89 1: (*,local)
90 0: (*,*)
91
92 We require exact key match i.e. if a key is present in packet
93 it will match only tunnel with the same key; if it is not present,
94 it will match only keyless tunnel.
95
96 All keysless packets, if not matched configured keyless tunnels
97 will match fallback tunnel.
98 */
99
100#define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(HASH_SIZE - 1))
101static u32 HASH_ADDR(const struct in6_addr *addr)
102{
103 u32 hash = ipv6_addr_hash(addr);
104
105 return hash_32(hash, HASH_SIZE_SHIFT);
106}
107
108#define tunnels_r_l tunnels[3]
109#define tunnels_r tunnels[2]
110#define tunnels_l tunnels[1]
111#define tunnels_wc tunnels[0]
c12b395a 112
c12b395a 113static struct rtnl_link_stats64 *ip6gre_get_stats64(struct net_device *dev,
114 struct rtnl_link_stats64 *tot)
115{
116 int i;
117
118 for_each_possible_cpu(i) {
119 const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i);
120 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
121 unsigned int start;
122
123 do {
124 start = u64_stats_fetch_begin_bh(&tstats->syncp);
125 rx_packets = tstats->rx_packets;
126 tx_packets = tstats->tx_packets;
127 rx_bytes = tstats->rx_bytes;
128 tx_bytes = tstats->tx_bytes;
129 } while (u64_stats_fetch_retry_bh(&tstats->syncp, start));
130
131 tot->rx_packets += rx_packets;
132 tot->tx_packets += tx_packets;
133 tot->rx_bytes += rx_bytes;
134 tot->tx_bytes += tx_bytes;
135 }
136
137 tot->multicast = dev->stats.multicast;
138 tot->rx_crc_errors = dev->stats.rx_crc_errors;
139 tot->rx_fifo_errors = dev->stats.rx_fifo_errors;
140 tot->rx_length_errors = dev->stats.rx_length_errors;
eccc1bb8 141 tot->rx_frame_errors = dev->stats.rx_frame_errors;
c12b395a 142 tot->rx_errors = dev->stats.rx_errors;
eccc1bb8 143
c12b395a 144 tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
145 tot->tx_carrier_errors = dev->stats.tx_carrier_errors;
146 tot->tx_dropped = dev->stats.tx_dropped;
147 tot->tx_aborted_errors = dev->stats.tx_aborted_errors;
148 tot->tx_errors = dev->stats.tx_errors;
149
150 return tot;
151}
152
153/* Given src, dst and key, find appropriate for input tunnel. */
154
155static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
156 const struct in6_addr *remote, const struct in6_addr *local,
157 __be32 key, __be16 gre_proto)
158{
159 struct net *net = dev_net(dev);
160 int link = dev->ifindex;
161 unsigned int h0 = HASH_ADDR(remote);
162 unsigned int h1 = HASH_KEY(key);
163 struct ip6_tnl *t, *cand = NULL;
164 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
165 int dev_type = (gre_proto == htons(ETH_P_TEB)) ?
166 ARPHRD_ETHER : ARPHRD_IP6GRE;
167 int score, cand_score = 4;
168
e086cadc 169 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
c12b395a 170 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
171 !ipv6_addr_equal(remote, &t->parms.raddr) ||
172 key != t->parms.i_key ||
173 !(t->dev->flags & IFF_UP))
174 continue;
175
176 if (t->dev->type != ARPHRD_IP6GRE &&
177 t->dev->type != dev_type)
178 continue;
179
180 score = 0;
181 if (t->parms.link != link)
182 score |= 1;
183 if (t->dev->type != dev_type)
184 score |= 2;
185 if (score == 0)
186 return t;
187
188 if (score < cand_score) {
189 cand = t;
190 cand_score = score;
191 }
192 }
193
e086cadc 194 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
c12b395a 195 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
196 key != t->parms.i_key ||
197 !(t->dev->flags & IFF_UP))
198 continue;
199
200 if (t->dev->type != ARPHRD_IP6GRE &&
201 t->dev->type != dev_type)
202 continue;
203
204 score = 0;
205 if (t->parms.link != link)
206 score |= 1;
207 if (t->dev->type != dev_type)
208 score |= 2;
209 if (score == 0)
210 return t;
211
212 if (score < cand_score) {
213 cand = t;
214 cand_score = score;
215 }
216 }
217
e086cadc 218 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
c12b395a 219 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
220 (!ipv6_addr_equal(local, &t->parms.raddr) ||
221 !ipv6_addr_is_multicast(local))) ||
222 key != t->parms.i_key ||
223 !(t->dev->flags & IFF_UP))
224 continue;
225
226 if (t->dev->type != ARPHRD_IP6GRE &&
227 t->dev->type != dev_type)
228 continue;
229
230 score = 0;
231 if (t->parms.link != link)
232 score |= 1;
233 if (t->dev->type != dev_type)
234 score |= 2;
235 if (score == 0)
236 return t;
237
238 if (score < cand_score) {
239 cand = t;
240 cand_score = score;
241 }
242 }
243
e086cadc 244 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
c12b395a 245 if (t->parms.i_key != key ||
246 !(t->dev->flags & IFF_UP))
247 continue;
248
249 if (t->dev->type != ARPHRD_IP6GRE &&
250 t->dev->type != dev_type)
251 continue;
252
253 score = 0;
254 if (t->parms.link != link)
255 score |= 1;
256 if (t->dev->type != dev_type)
257 score |= 2;
258 if (score == 0)
259 return t;
260
261 if (score < cand_score) {
262 cand = t;
263 cand_score = score;
264 }
265 }
266
267 if (cand != NULL)
268 return cand;
269
270 dev = ign->fb_tunnel_dev;
271 if (dev->flags & IFF_UP)
272 return netdev_priv(dev);
273
274 return NULL;
275}
276
277static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
278 const struct __ip6_tnl_parm *p)
279{
280 const struct in6_addr *remote = &p->raddr;
281 const struct in6_addr *local = &p->laddr;
282 unsigned int h = HASH_KEY(p->i_key);
283 int prio = 0;
284
285 if (!ipv6_addr_any(local))
286 prio |= 1;
287 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
288 prio |= 2;
289 h ^= HASH_ADDR(remote);
290 }
291
292 return &ign->tunnels[prio][h];
293}
294
295static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
296 const struct ip6_tnl *t)
297{
298 return __ip6gre_bucket(ign, &t->parms);
299}
300
301static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
302{
303 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
304
305 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
306 rcu_assign_pointer(*tp, t);
307}
308
309static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
310{
311 struct ip6_tnl __rcu **tp;
312 struct ip6_tnl *iter;
313
314 for (tp = ip6gre_bucket(ign, t);
315 (iter = rtnl_dereference(*tp)) != NULL;
316 tp = &iter->next) {
317 if (t == iter) {
318 rcu_assign_pointer(*tp, t->next);
319 break;
320 }
321 }
322}
323
324static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
325 const struct __ip6_tnl_parm *parms,
326 int type)
327{
328 const struct in6_addr *remote = &parms->raddr;
329 const struct in6_addr *local = &parms->laddr;
330 __be32 key = parms->i_key;
331 int link = parms->link;
332 struct ip6_tnl *t;
333 struct ip6_tnl __rcu **tp;
334 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
335
336 for (tp = __ip6gre_bucket(ign, parms);
337 (t = rtnl_dereference(*tp)) != NULL;
338 tp = &t->next)
339 if (ipv6_addr_equal(local, &t->parms.laddr) &&
340 ipv6_addr_equal(remote, &t->parms.raddr) &&
341 key == t->parms.i_key &&
342 link == t->parms.link &&
343 type == t->dev->type)
344 break;
345
346 return t;
347}
348
349static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
350 const struct __ip6_tnl_parm *parms, int create)
351{
352 struct ip6_tnl *t, *nt;
353 struct net_device *dev;
354 char name[IFNAMSIZ];
355 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
356
357 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
358 if (t || !create)
359 return t;
360
361 if (parms->name[0])
362 strlcpy(name, parms->name, IFNAMSIZ);
363 else
364 strcpy(name, "ip6gre%d");
365
366 dev = alloc_netdev(sizeof(*t), name, ip6gre_tunnel_setup);
367 if (!dev)
368 return NULL;
369
370 dev_net_set(dev, net);
371
372 nt = netdev_priv(dev);
373 nt->parms = *parms;
374 dev->rtnl_link_ops = &ip6gre_link_ops;
375
376 nt->dev = dev;
377 ip6gre_tnl_link_config(nt, 1);
378
379 if (register_netdevice(dev) < 0)
380 goto failed_free;
381
382 /* Can use a lockless transmit, unless we generate output sequences */
383 if (!(nt->parms.o_flags & GRE_SEQ))
384 dev->features |= NETIF_F_LLTX;
385
386 dev_hold(dev);
387 ip6gre_tunnel_link(ign, nt);
388 return nt;
389
390failed_free:
391 free_netdev(dev);
392 return NULL;
393}
394
395static void ip6gre_tunnel_uninit(struct net_device *dev)
396{
397 struct net *net = dev_net(dev);
398 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
399
400 ip6gre_tunnel_unlink(ign, netdev_priv(dev));
401 dev_put(dev);
402}
403
404
405static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
406 u8 type, u8 code, int offset, __be32 info)
407{
408 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
b87fb39e
ED		 409 __be16 *p = (__be16 *)(skb->data + offset);
410 int grehlen = offset + 4;
c12b395a 411 struct ip6_tnl *t;
412 __be16 flags;
413
414 flags = p[0];
415 if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) {
416 if (flags&(GRE_VERSION|GRE_ROUTING))
417 return;
418 if (flags&GRE_KEY) {
419 grehlen += 4;
420 if (flags&GRE_CSUM)
421 grehlen += 4;
422 }
423 }
424
425 /* If only 8 bytes returned, keyed message will be dropped here */
b87fb39e 426 if (!pskb_may_pull(skb, grehlen))
c12b395a 427 return;
b87fb39e
ED		 428 ipv6h = (const struct ipv6hdr *)skb->data;
429 p = (__be16 *)(skb->data + offset);
c12b395a 430
c12b395a 431 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
432 flags & GRE_KEY ?
433 *(((__be32 *)p) + (grehlen / 4) - 1) : 0,
434 p[1]);
435 if (t == NULL)
0c5794a6 436 return;
c12b395a 437
438 switch (type) {
439 __u32 teli;
440 struct ipv6_tlv_tnl_enc_lim *tel;
441 __u32 mtu;
442 case ICMPV6_DEST_UNREACH:
443 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
444 t->parms.name);
445 break;
446 case ICMPV6_TIME_EXCEED:
447 if (code == ICMPV6_EXC_HOPLIMIT) {
448 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
449 t->parms.name);
450 }
451 break;
452 case ICMPV6_PARAMPROB:
453 teli = 0;
454 if (code == ICMPV6_HDR_FIELD)
455 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
456
457 if (teli && teli == info - 2) {
458 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
459 if (tel->encap_limit == 0) {
460 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
461 t->parms.name);
462 }
463 } else {
464 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
465 t->parms.name);
466 }
467 break;
468 case ICMPV6_PKT_TOOBIG:
469 mtu = info - offset;
470 if (mtu < IPV6_MIN_MTU)
471 mtu = IPV6_MIN_MTU;
472 t->dev->mtu = mtu;
473 break;
474 }
475
476 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
477 t->err_count++;
478 else
479 t->err_count = 1;
480 t->err_time = jiffies;
c12b395a 481}
482
c12b395a 483static int ip6gre_rcv(struct sk_buff *skb)
484{
485 const struct ipv6hdr *ipv6h;
486 u8 *h;
487 __be16 flags;
488 __sum16 csum = 0;
489 __be32 key = 0;
490 u32 seqno = 0;
491 struct ip6_tnl *tunnel;
492 int offset = 4;
493 __be16 gre_proto;
eccc1bb8 494 int err;
c12b395a 495
496 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
0c5794a6 497 goto drop;
c12b395a 498
499 ipv6h = ipv6_hdr(skb);
500 h = skb->data;
501 flags = *(__be16 *)h;
502
503 if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) {
504 /* - Version must be 0.
505 - We do not support routing headers.
506 */
507 if (flags&(GRE_VERSION|GRE_ROUTING))
0c5794a6 508 goto drop;
c12b395a 509
510 if (flags&GRE_CSUM) {
511 switch (skb->ip_summed) {
512 case CHECKSUM_COMPLETE:
513 csum = csum_fold(skb->csum);
514 if (!csum)
515 break;
516 /* fall through */
517 case CHECKSUM_NONE:
518 skb->csum = 0;
519 csum = __skb_checksum_complete(skb);
520 skb->ip_summed = CHECKSUM_COMPLETE;
521 }
522 offset += 4;
523 }
524 if (flags&GRE_KEY) {
525 key = *(__be32 *)(h + offset);
526 offset += 4;
527 }
528 if (flags&GRE_SEQ) {
529 seqno = ntohl(*(__be32 *)(h + offset));
530 offset += 4;
531 }
532 }
533
534 gre_proto = *(__be16 *)(h + 2);
535
c12b395a 536 tunnel = ip6gre_tunnel_lookup(skb->dev,
537 &ipv6h->saddr, &ipv6h->daddr, key,
538 gre_proto);
539 if (tunnel) {
540 struct pcpu_tstats *tstats;
541
542 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
543 goto drop;
544
545 if (!ip6_tnl_rcv_ctl(tunnel, &ipv6h->daddr, &ipv6h->saddr)) {
546 tunnel->dev->stats.rx_dropped++;
547 goto drop;
548 }
549
550 secpath_reset(skb);
551
552 skb->protocol = gre_proto;
553 /* WCCP version 1 and 2 protocol decoding.
554 * - Change protocol to IP
555 * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
556 */
557 if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) {
558 skb->protocol = htons(ETH_P_IP);
559 if ((*(h + offset) & 0xF0) != 0x40)
560 offset += 4;
561 }
562
563 skb->mac_header = skb->network_header;
564 __pskb_pull(skb, offset);
565 skb_postpull_rcsum(skb, skb_transport_header(skb), offset);
566 skb->pkt_type = PACKET_HOST;
567
568 if (((flags&GRE_CSUM) && csum) ||
569 (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) {
570 tunnel->dev->stats.rx_crc_errors++;
571 tunnel->dev->stats.rx_errors++;
572 goto drop;
573 }
574 if (tunnel->parms.i_flags&GRE_SEQ) {
575 if (!(flags&GRE_SEQ) ||
576 (tunnel->i_seqno &&
577 (s32)(seqno - tunnel->i_seqno) < 0)) {
578 tunnel->dev->stats.rx_fifo_errors++;
579 tunnel->dev->stats.rx_errors++;
580 goto drop;
581 }
582 tunnel->i_seqno = seqno + 1;
583 }
584
585 /* Warning: All skb pointers will be invalidated! */
586 if (tunnel->dev->type == ARPHRD_ETHER) {
587 if (!pskb_may_pull(skb, ETH_HLEN)) {
588 tunnel->dev->stats.rx_length_errors++;
589 tunnel->dev->stats.rx_errors++;
590 goto drop;
591 }
592
593 ipv6h = ipv6_hdr(skb);
594 skb->protocol = eth_type_trans(skb, tunnel->dev);
595 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
596 }
597
eccc1bb8 598 __skb_tunnel_rx(skb, tunnel->dev);
599
600 skb_reset_network_header(skb);
601
602 err = IP6_ECN_decapsulate(ipv6h, skb);
603 if (unlikely(err)) {
604 if (log_ecn_error)
605 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
606 &ipv6h->saddr,
607 ipv6_get_dsfield(ipv6h));
608 if (err > 1) {
609 ++tunnel->dev->stats.rx_frame_errors;
610 ++tunnel->dev->stats.rx_errors;
611 goto drop;
612 }
613 }
614
c12b395a 615 tstats = this_cpu_ptr(tunnel->dev->tstats);
616 u64_stats_update_begin(&tstats->syncp);
617 tstats->rx_packets++;
618 tstats->rx_bytes += skb->len;
619 u64_stats_update_end(&tstats->syncp);
620
c12b395a 621 netif_rx(skb);
622
c12b395a 623 return 0;
624 }
625 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
626
627drop:
c12b395a 628 kfree_skb(skb);
629 return 0;
630}
631
632struct ipv6_tel_txoption {
633 struct ipv6_txoptions ops;
634 __u8 dst_opt[8];
635};
636
637static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
638{
639 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
640
641 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
642 opt->dst_opt[3] = 1;
643 opt->dst_opt[4] = encap_limit;
644 opt->dst_opt[5] = IPV6_TLV_PADN;
645 opt->dst_opt[6] = 1;
646
647 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
648 opt->ops.opt_nflen = 8;
649}
650
651static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb,
652 struct net_device *dev,
653 __u8 dsfield,
654 struct flowi6 *fl6,
655 int encap_limit,
656 __u32 *pmtu)
657{
658 struct net *net = dev_net(dev);
659 struct ip6_tnl *tunnel = netdev_priv(dev);
660 struct net_device *tdev; /* Device to other host */
661 struct ipv6hdr *ipv6h; /* Our new IP header */
662 unsigned int max_headroom; /* The extra header space needed */
663 int gre_hlen;
664 struct ipv6_tel_txoption opt;
665 int mtu;
666 struct dst_entry *dst = NULL, *ndst = NULL;
667 struct net_device_stats *stats = &tunnel->dev->stats;
668 int err = -1;
669 u8 proto;
670 int pkt_len;
671 struct sk_buff *new_skb;
672
673 if (dev->type == ARPHRD_ETHER)
674 IPCB(skb)->flags = 0;
675
676 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) {
677 gre_hlen = 0;
678 ipv6h = (struct ipv6hdr *)skb->data;
679 fl6->daddr = ipv6h->daddr;
680 } else {
681 gre_hlen = tunnel->hlen;
682 fl6->daddr = tunnel->parms.raddr;
683 }
684
685 if (!fl6->flowi6_mark)
686 dst = ip6_tnl_dst_check(tunnel);
687
688 if (!dst) {
689 ndst = ip6_route_output(net, NULL, fl6);
690
691 if (ndst->error)
692 goto tx_err_link_failure;
693 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
694 if (IS_ERR(ndst)) {
695 err = PTR_ERR(ndst);
696 ndst = NULL;
697 goto tx_err_link_failure;
698 }
699 dst = ndst;
700 }
701
702 tdev = dst->dev;
703
704 if (tdev == dev) {
705 stats->collisions++;
706 net_warn_ratelimited("%s: Local routing loop detected!\n",
707 tunnel->parms.name);
708 goto tx_err_dst_release;
709 }
710
711 mtu = dst_mtu(dst) - sizeof(*ipv6h);
712 if (encap_limit >= 0) {
713 max_headroom += 8;
714 mtu -= 8;
715 }
716 if (mtu < IPV6_MIN_MTU)
717 mtu = IPV6_MIN_MTU;
718 if (skb_dst(skb))
719 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
720 if (skb->len > mtu) {
721 *pmtu = mtu;
722 err = -EMSGSIZE;
723 goto tx_err_dst_release;
724 }
725
726 if (tunnel->err_count > 0) {
727 if (time_before(jiffies,
728 tunnel->err_time + IP6TUNNEL_ERR_TIMEO)) {
729 tunnel->err_count--;
730
731 dst_link_failure(skb);
732 } else
733 tunnel->err_count = 0;
734 }
735
736 max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen + dst->header_len;
737
738 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
739 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
740 new_skb = skb_realloc_headroom(skb, max_headroom);
741 if (max_headroom > dev->needed_headroom)
742 dev->needed_headroom = max_headroom;
743 if (!new_skb)
744 goto tx_err_dst_release;
745
746 if (skb->sk)
747 skb_set_owner_w(new_skb, skb->sk);
748 consume_skb(skb);
749 skb = new_skb;
750 }
751
752 skb_dst_drop(skb);
753
754 if (fl6->flowi6_mark) {
755 skb_dst_set(skb, dst);
756 ndst = NULL;
757 } else {
758 skb_dst_set_noref(skb, dst);
759 }
760
761 skb->transport_header = skb->network_header;
762
763 proto = NEXTHDR_GRE;
764 if (encap_limit >= 0) {
765 init_tel_txopt(&opt, encap_limit);
766 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
767 }
768
769 skb_push(skb, gre_hlen);
770 skb_reset_network_header(skb);
771
772 /*
773 * Push down and install the IP header.
774 */
775 ipv6h = ipv6_hdr(skb);
776 *(__be32 *)ipv6h = fl6->flowlabel | htonl(0x60000000);
777 dsfield = INET_ECN_encapsulate(0, dsfield);
778 ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield);
779 ipv6h->hop_limit = tunnel->parms.hop_limit;
780 ipv6h->nexthdr = proto;
781 ipv6h->saddr = fl6->saddr;
782 ipv6h->daddr = fl6->daddr;
783
784 ((__be16 *)(ipv6h + 1))[0] = tunnel->parms.o_flags;
785 ((__be16 *)(ipv6h + 1))[1] = (dev->type == ARPHRD_ETHER) ?
786 htons(ETH_P_TEB) : skb->protocol;
787
788 if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) {
789 __be32 *ptr = (__be32 *)(((u8 *)ipv6h) + tunnel->hlen - 4);
790
791 if (tunnel->parms.o_flags&GRE_SEQ) {
792 ++tunnel->o_seqno;
793 *ptr = htonl(tunnel->o_seqno);
794 ptr--;
795 }
796 if (tunnel->parms.o_flags&GRE_KEY) {
797 *ptr = tunnel->parms.o_key;
798 ptr--;
799 }
800 if (tunnel->parms.o_flags&GRE_CSUM) {
801 *ptr = 0;
802 *(__sum16 *)ptr = ip_compute_csum((void *)(ipv6h+1),
803 skb->len - sizeof(struct ipv6hdr));
804 }
805 }
806
807 nf_reset(skb);
808 pkt_len = skb->len;
809 err = ip6_local_out(skb);
810
811 if (net_xmit_eval(err) == 0) {
812 struct pcpu_tstats *tstats = this_cpu_ptr(tunnel->dev->tstats);
813
814 tstats->tx_bytes += pkt_len;
815 tstats->tx_packets++;
816 } else {
817 stats->tx_errors++;
818 stats->tx_aborted_errors++;
819 }
820
821 if (ndst)
822 ip6_tnl_dst_store(tunnel, ndst);
823
824 return 0;
825tx_err_link_failure:
826 stats->tx_carrier_errors++;
827 dst_link_failure(skb);
828tx_err_dst_release:
829 dst_release(ndst);
830 return err;
831}
832
833static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
834{
835 struct ip6_tnl *t = netdev_priv(dev);
836 const struct iphdr *iph = ip_hdr(skb);
837 int encap_limit = -1;
838 struct flowi6 fl6;
839 __u8 dsfield;
840 __u32 mtu;
841 int err;
842
843 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
844 encap_limit = t->parms.encap_limit;
845
846 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
847 fl6.flowi6_proto = IPPROTO_IPIP;
848
849 dsfield = ipv4_get_dsfield(iph);
850
851 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
852 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
853 & IPV6_TCLASS_MASK;
854 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
855 fl6.flowi6_mark = skb->mark;
856
857 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
858 if (err != 0) {
859 /* XXX: send ICMP error even if DF is not set. */
860 if (err == -EMSGSIZE)
861 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
862 htonl(mtu));
863 return -1;
864 }
865
866 return 0;
867}
868
869static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
870{
871 struct ip6_tnl *t = netdev_priv(dev);
872 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
873 int encap_limit = -1;
874 __u16 offset;
875 struct flowi6 fl6;
876 __u8 dsfield;
877 __u32 mtu;
878 int err;
879
880 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
881 return -1;
882
883 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
884 if (offset > 0) {
885 struct ipv6_tlv_tnl_enc_lim *tel;
886 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
887 if (tel->encap_limit == 0) {
888 icmpv6_send(skb, ICMPV6_PARAMPROB,
889 ICMPV6_HDR_FIELD, offset + 2);
890 return -1;
891 }
892 encap_limit = tel->encap_limit - 1;
893 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
894 encap_limit = t->parms.encap_limit;
895
896 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
897 fl6.flowi6_proto = IPPROTO_IPV6;
898
899 dsfield = ipv6_get_dsfield(ipv6h);
900 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
901 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
902 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
903 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK);
904 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
905 fl6.flowi6_mark = skb->mark;
906
907 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
908 if (err != 0) {
909 if (err == -EMSGSIZE)
910 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
911 return -1;
912 }
913
914 return 0;
915}
916
917/**
918 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
919 * @t: the outgoing tunnel device
920 * @hdr: IPv6 header from the incoming packet
921 *
922 * Description:
923 * Avoid trivial tunneling loop by checking that tunnel exit-point
924 * doesn't match source of incoming packet.
925 *
926 * Return:
927 * 1 if conflict,
928 * 0 else
929 **/
930
931static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
932 const struct ipv6hdr *hdr)
933{
934 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
935}
936
937static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
938{
939 struct ip6_tnl *t = netdev_priv(dev);
940 int encap_limit = -1;
941 struct flowi6 fl6;
942 __u32 mtu;
943 int err;
944
945 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
946 encap_limit = t->parms.encap_limit;
947
948 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
949 fl6.flowi6_proto = skb->protocol;
950
951 err = ip6gre_xmit2(skb, dev, 0, &fl6, encap_limit, &mtu);
952
953 return err;
954}
955
956static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
957 struct net_device *dev)
958{
959 struct ip6_tnl *t = netdev_priv(dev);
960 struct net_device_stats *stats = &t->dev->stats;
961 int ret;
962
963 if (!ip6_tnl_xmit_ctl(t))
964 return -1;
965
966 switch (skb->protocol) {
967 case htons(ETH_P_IP):
968 ret = ip6gre_xmit_ipv4(skb, dev);
969 break;
970 case htons(ETH_P_IPV6):
971 ret = ip6gre_xmit_ipv6(skb, dev);
972 break;
973 default:
974 ret = ip6gre_xmit_other(skb, dev);
975 break;
976 }
977
978 if (ret < 0)
979 goto tx_err;
980
981 return NETDEV_TX_OK;
982
983tx_err:
984 stats->tx_errors++;
985 stats->tx_dropped++;
986 kfree_skb(skb);
987 return NETDEV_TX_OK;
988}
989
990static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
991{
992 struct net_device *dev = t->dev;
993 struct __ip6_tnl_parm *p = &t->parms;
994 struct flowi6 *fl6 = &t->fl.u.ip6;
995 int addend = sizeof(struct ipv6hdr) + 4;
996
997 if (dev->type != ARPHRD_ETHER) {
998 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
999 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1000 }
1001
1002 /* Set up flowi template */
1003 fl6->saddr = p->laddr;
1004 fl6->daddr = p->raddr;
1005 fl6->flowi6_oif = p->link;
1006 fl6->flowlabel = 0;
1007
1008 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1009 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1010 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1011 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1012
1013 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1014 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1015
1016 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1017 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1018 dev->flags |= IFF_POINTOPOINT;
1019 else
1020 dev->flags &= ~IFF_POINTOPOINT;
1021
1022 dev->iflink = p->link;
1023
1024 /* Precalculate GRE options length */
1025 if (t->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) {
1026 if (t->parms.o_flags&GRE_CSUM)
1027 addend += 4;
1028 if (t->parms.o_flags&GRE_KEY)
1029 addend += 4;
1030 if (t->parms.o_flags&GRE_SEQ)
1031 addend += 4;
1032 }
1033
1034 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1035 int strict = (ipv6_addr_type(&p->raddr) &
1036 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1037
1038 struct rt6_info *rt = rt6_lookup(dev_net(dev),
1039 &p->raddr, &p->laddr,
1040 p->link, strict);
1041
1042 if (rt == NULL)
1043 return;
1044
1045 if (rt->dst.dev) {
1046 dev->hard_header_len = rt->dst.dev->hard_header_len + addend;
1047
1048 if (set_mtu) {
1049 dev->mtu = rt->dst.dev->mtu - addend;
1050 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1051 dev->mtu -= 8;
1052
1053 if (dev->mtu < IPV6_MIN_MTU)
1054 dev->mtu = IPV6_MIN_MTU;
1055 }
1056 }
94e187c0 1057 ip6_rt_put(rt);
c12b395a 1058 }
1059
1060 t->hlen = addend;
1061}
1062
1063static int ip6gre_tnl_change(struct ip6_tnl *t,
1064 const struct __ip6_tnl_parm *p, int set_mtu)
1065{
1066 t->parms.laddr = p->laddr;
1067 t->parms.raddr = p->raddr;
1068 t->parms.flags = p->flags;
1069 t->parms.hop_limit = p->hop_limit;
1070 t->parms.encap_limit = p->encap_limit;
1071 t->parms.flowinfo = p->flowinfo;
1072 t->parms.link = p->link;
1073 t->parms.proto = p->proto;
1074 t->parms.i_key = p->i_key;
1075 t->parms.o_key = p->o_key;
1076 t->parms.i_flags = p->i_flags;
1077 t->parms.o_flags = p->o_flags;
1078 ip6_tnl_dst_reset(t);
1079 ip6gre_tnl_link_config(t, set_mtu);
1080 return 0;
1081}
1082
1083static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1084 const struct ip6_tnl_parm2 *u)
1085{
1086 p->laddr = u->laddr;
1087 p->raddr = u->raddr;
1088 p->flags = u->flags;
1089 p->hop_limit = u->hop_limit;
1090 p->encap_limit = u->encap_limit;
1091 p->flowinfo = u->flowinfo;
1092 p->link = u->link;
1093 p->i_key = u->i_key;
1094 p->o_key = u->o_key;
1095 p->i_flags = u->i_flags;
1096 p->o_flags = u->o_flags;
1097 memcpy(p->name, u->name, sizeof(u->name));
1098}
1099
1100static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1101 const struct __ip6_tnl_parm *p)
1102{
1103 u->proto = IPPROTO_GRE;
1104 u->laddr = p->laddr;
1105 u->raddr = p->raddr;
1106 u->flags = p->flags;
1107 u->hop_limit = p->hop_limit;
1108 u->encap_limit = p->encap_limit;
1109 u->flowinfo = p->flowinfo;
1110 u->link = p->link;
1111 u->i_key = p->i_key;
1112 u->o_key = p->o_key;
1113 u->i_flags = p->i_flags;
1114 u->o_flags = p->o_flags;
1115 memcpy(u->name, p->name, sizeof(u->name));
1116}
1117
1118static int ip6gre_tunnel_ioctl(struct net_device *dev,
1119 struct ifreq *ifr, int cmd)
1120{
1121 int err = 0;
1122 struct ip6_tnl_parm2 p;
1123 struct __ip6_tnl_parm p1;
1124 struct ip6_tnl *t;
1125 struct net *net = dev_net(dev);
1126 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1127
1128 switch (cmd) {
1129 case SIOCGETTUNNEL:
1130 t = NULL;
1131 if (dev == ign->fb_tunnel_dev) {
1132 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1133 err = -EFAULT;
1134 break;
1135 }
1136 ip6gre_tnl_parm_from_user(&p1, &p);
1137 t = ip6gre_tunnel_locate(net, &p1, 0);
1138 }
1139 if (t == NULL)
1140 t = netdev_priv(dev);
1141 ip6gre_tnl_parm_to_user(&p, &t->parms);
1142 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1143 err = -EFAULT;
1144 break;
1145
1146 case SIOCADDTUNNEL:
1147 case SIOCCHGTUNNEL:
1148 err = -EPERM;
1149 if (!capable(CAP_NET_ADMIN))
1150 goto done;
1151
1152 err = -EFAULT;
1153 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1154 goto done;
1155
1156 err = -EINVAL;
1157 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1158 goto done;
1159
1160 if (!(p.i_flags&GRE_KEY))
1161 p.i_key = 0;
1162 if (!(p.o_flags&GRE_KEY))
1163 p.o_key = 0;
1164
1165 ip6gre_tnl_parm_from_user(&p1, &p);
1166 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1167
1168 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1169 if (t != NULL) {
1170 if (t->dev != dev) {
1171 err = -EEXIST;
1172 break;
1173 }
1174 } else {
1175 t = netdev_priv(dev);
1176
1177 ip6gre_tunnel_unlink(ign, t);
1178 synchronize_net();
1179 ip6gre_tnl_change(t, &p1, 1);
1180 ip6gre_tunnel_link(ign, t);
1181 netdev_state_change(dev);
1182 }
1183 }
1184
1185 if (t) {
1186 err = 0;
1187
1188 ip6gre_tnl_parm_to_user(&p, &t->parms);
1189 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1190 err = -EFAULT;
1191 } else
1192 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1193 break;
1194
1195 case SIOCDELTUNNEL:
1196 err = -EPERM;
1197 if (!capable(CAP_NET_ADMIN))
1198 goto done;
1199
1200 if (dev == ign->fb_tunnel_dev) {
1201 err = -EFAULT;
1202 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1203 goto done;
1204 err = -ENOENT;
1205 ip6gre_tnl_parm_from_user(&p1, &p);
1206 t = ip6gre_tunnel_locate(net, &p1, 0);
1207 if (t == NULL)
1208 goto done;
1209 err = -EPERM;
1210 if (t == netdev_priv(ign->fb_tunnel_dev))
1211 goto done;
1212 dev = t->dev;
1213 }
1214 unregister_netdevice(dev);
1215 err = 0;
1216 break;
1217
1218 default:
1219 err = -EINVAL;
1220 }
1221
1222done:
1223 return err;
1224}
1225
1226static int ip6gre_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1227{
1228 struct ip6_tnl *tunnel = netdev_priv(dev);
1229 if (new_mtu < 68 ||
1230 new_mtu > 0xFFF8 - dev->hard_header_len - tunnel->hlen)
1231 return -EINVAL;
1232 dev->mtu = new_mtu;
1233 return 0;
1234}
1235
1236static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1237 unsigned short type,
1238 const void *daddr, const void *saddr, unsigned int len)
1239{
1240 struct ip6_tnl *t = netdev_priv(dev);
1241 struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen);
1242 __be16 *p = (__be16 *)(ipv6h+1);
1243
1244 *(__be32 *)ipv6h = t->fl.u.ip6.flowlabel | htonl(0x60000000);
1245 ipv6h->hop_limit = t->parms.hop_limit;
1246 ipv6h->nexthdr = NEXTHDR_GRE;
1247 ipv6h->saddr = t->parms.laddr;
1248 ipv6h->daddr = t->parms.raddr;
1249
1250 p[0] = t->parms.o_flags;
1251 p[1] = htons(type);
1252
1253 /*
1254 * Set the source hardware address.
1255 */
1256
1257 if (saddr)
1258 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1259 if (daddr)
1260 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1261 if (!ipv6_addr_any(&ipv6h->daddr))
1262 return t->hlen;
1263
1264 return -t->hlen;
1265}
1266
c12b395a 1267static const struct header_ops ip6gre_header_ops = {
1268 .create = ip6gre_header,
c12b395a 1269};
1270
1271static const struct net_device_ops ip6gre_netdev_ops = {
1272 .ndo_init = ip6gre_tunnel_init,
1273 .ndo_uninit = ip6gre_tunnel_uninit,
1274 .ndo_start_xmit = ip6gre_tunnel_xmit,
1275 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1276 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1277 .ndo_get_stats64 = ip6gre_get_stats64,
1278};
1279
1280static void ip6gre_dev_free(struct net_device *dev)
1281{
1282 free_percpu(dev->tstats);
1283 free_netdev(dev);
1284}
1285
1286static void ip6gre_tunnel_setup(struct net_device *dev)
1287{
1288 struct ip6_tnl *t;
1289
1290 dev->netdev_ops = &ip6gre_netdev_ops;
1291 dev->destructor = ip6gre_dev_free;
1292
1293 dev->type = ARPHRD_IP6GRE;
1294 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr) + 4;
1295 dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr) - 4;
1296 t = netdev_priv(dev);
1297 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1298 dev->mtu -= 8;
1299 dev->flags |= IFF_NOARP;
1300 dev->iflink = 0;
1301 dev->addr_len = sizeof(struct in6_addr);
1302 dev->features |= NETIF_F_NETNS_LOCAL;
1303 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1304}
1305
1306static int ip6gre_tunnel_init(struct net_device *dev)
1307{
1308 struct ip6_tnl *tunnel;
1309
1310 tunnel = netdev_priv(dev);
1311
1312 tunnel->dev = dev;
1313 strcpy(tunnel->parms.name, dev->name);
1314
1315 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1316 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1317
1318 if (ipv6_addr_any(&tunnel->parms.raddr))
1319 dev->header_ops = &ip6gre_header_ops;
1320
1321 dev->tstats = alloc_percpu(struct pcpu_tstats);
1322 if (!dev->tstats)
1323 return -ENOMEM;
1324
1325 return 0;
1326}
1327
1328static void ip6gre_fb_tunnel_init(struct net_device *dev)
1329{
1330 struct ip6_tnl *tunnel = netdev_priv(dev);
1331
1332 tunnel->dev = dev;
1333 strcpy(tunnel->parms.name, dev->name);
1334
1335 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1336
1337 dev_hold(dev);
1338}
1339
1340
1341static struct inet6_protocol ip6gre_protocol __read_mostly = {
1342 .handler = ip6gre_rcv,
1343 .err_handler = ip6gre_err,
1344 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1345};
1346
1347static void ip6gre_destroy_tunnels(struct ip6gre_net *ign,
1348 struct list_head *head)
1349{
1350 int prio;
1351
1352 for (prio = 0; prio < 4; prio++) {
1353 int h;
1354 for (h = 0; h < HASH_SIZE; h++) {
1355 struct ip6_tnl *t;
1356
1357 t = rtnl_dereference(ign->tunnels[prio][h]);
1358
1359 while (t != NULL) {
1360 unregister_netdevice_queue(t->dev, head);
1361 t = rtnl_dereference(t->next);
1362 }
1363 }
1364 }
1365}
1366
1367static int __net_init ip6gre_init_net(struct net *net)
1368{
1369 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1370 int err;
1371
1372 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1373 ip6gre_tunnel_setup);
1374 if (!ign->fb_tunnel_dev) {
1375 err = -ENOMEM;
1376 goto err_alloc_dev;
1377 }
1378 dev_net_set(ign->fb_tunnel_dev, net);
1379
1380 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1381 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1382
1383 err = register_netdev(ign->fb_tunnel_dev);
1384 if (err)
1385 goto err_reg_dev;
1386
1387 rcu_assign_pointer(ign->tunnels_wc[0],
1388 netdev_priv(ign->fb_tunnel_dev));
1389 return 0;
1390
1391err_reg_dev:
1392 ip6gre_dev_free(ign->fb_tunnel_dev);
1393err_alloc_dev:
1394 return err;
1395}
1396
1397static void __net_exit ip6gre_exit_net(struct net *net)
1398{
1399 struct ip6gre_net *ign;
1400 LIST_HEAD(list);
1401
1402 ign = net_generic(net, ip6gre_net_id);
1403 rtnl_lock();
1404 ip6gre_destroy_tunnels(ign, &list);
1405 unregister_netdevice_many(&list);
1406 rtnl_unlock();
1407}
1408
1409static struct pernet_operations ip6gre_net_ops = {
1410 .init = ip6gre_init_net,
1411 .exit = ip6gre_exit_net,
1412 .id = &ip6gre_net_id,
1413 .size = sizeof(struct ip6gre_net),
1414};
1415
1416static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
1417{
1418 __be16 flags;
1419
1420 if (!data)
1421 return 0;
1422
1423 flags = 0;
1424 if (data[IFLA_GRE_IFLAGS])
1425 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1426 if (data[IFLA_GRE_OFLAGS])
1427 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1428 if (flags & (GRE_VERSION|GRE_ROUTING))
1429 return -EINVAL;
1430
1431 return 0;
1432}
1433
1434static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[])
1435{
1436 struct in6_addr daddr;
1437
1438 if (tb[IFLA_ADDRESS]) {
1439 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1440 return -EINVAL;
1441 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1442 return -EADDRNOTAVAIL;
1443 }
1444
1445 if (!data)
1446 goto out;
1447
1448 if (data[IFLA_GRE_REMOTE]) {
1449 nla_memcpy(&daddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr));
1450 if (ipv6_addr_any(&daddr))
1451 return -EINVAL;
1452 }
1453
1454out:
1455 return ip6gre_tunnel_validate(tb, data);
1456}
1457
1458
1459static void ip6gre_netlink_parms(struct nlattr *data[],
1460 struct __ip6_tnl_parm *parms)
1461{
1462 memset(parms, 0, sizeof(*parms));
1463
1464 if (!data)
1465 return;
1466
1467 if (data[IFLA_GRE_LINK])
1468 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1469
1470 if (data[IFLA_GRE_IFLAGS])
1471 parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]);
1472
1473 if (data[IFLA_GRE_OFLAGS])
1474 parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]);
1475
1476 if (data[IFLA_GRE_IKEY])
1477 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1478
1479 if (data[IFLA_GRE_OKEY])
1480 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1481
1482 if (data[IFLA_GRE_LOCAL])
1483 nla_memcpy(&parms->laddr, data[IFLA_GRE_LOCAL], sizeof(struct in6_addr));
1484
1485 if (data[IFLA_GRE_REMOTE])
1486 nla_memcpy(&parms->raddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr));
1487
1488 if (data[IFLA_GRE_TTL])
1489 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1490
1491 if (data[IFLA_GRE_ENCAP_LIMIT])
1492 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1493
1494 if (data[IFLA_GRE_FLOWINFO])
1495 parms->flowinfo = nla_get_u32(data[IFLA_GRE_FLOWINFO]);
1496
1497 if (data[IFLA_GRE_FLAGS])
1498 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1499}
1500
1501static int ip6gre_tap_init(struct net_device *dev)
1502{
1503 struct ip6_tnl *tunnel;
1504
1505 tunnel = netdev_priv(dev);
1506
1507 tunnel->dev = dev;
1508 strcpy(tunnel->parms.name, dev->name);
1509
1510 ip6gre_tnl_link_config(tunnel, 1);
1511
1512 dev->tstats = alloc_percpu(struct pcpu_tstats);
1513 if (!dev->tstats)
1514 return -ENOMEM;
1515
1516 return 0;
1517}
1518
1519static const struct net_device_ops ip6gre_tap_netdev_ops = {
1520 .ndo_init = ip6gre_tap_init,
1521 .ndo_uninit = ip6gre_tunnel_uninit,
1522 .ndo_start_xmit = ip6gre_tunnel_xmit,
1523 .ndo_set_mac_address = eth_mac_addr,
1524 .ndo_validate_addr = eth_validate_addr,
1525 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1526 .ndo_get_stats64 = ip6gre_get_stats64,
1527};
1528
1529static void ip6gre_tap_setup(struct net_device *dev)
1530{
1531
1532 ether_setup(dev);
1533
1534 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1535 dev->destructor = ip6gre_dev_free;
1536
1537 dev->iflink = 0;
1538 dev->features |= NETIF_F_NETNS_LOCAL;
1539}
1540
1541static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1542 struct nlattr *tb[], struct nlattr *data[])
1543{
1544 struct ip6_tnl *nt;
1545 struct net *net = dev_net(dev);
1546 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1547 int err;
1548
1549 nt = netdev_priv(dev);
1550 ip6gre_netlink_parms(data, &nt->parms);
1551
1552 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1553 return -EEXIST;
1554
1555 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1556 eth_hw_addr_random(dev);
1557
1558 nt->dev = dev;
1559 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1560
1561 /* Can use a lockless transmit, unless we generate output sequences */
1562 if (!(nt->parms.o_flags & GRE_SEQ))
1563 dev->features |= NETIF_F_LLTX;
1564
1565 err = register_netdevice(dev);
1566 if (err)
1567 goto out;
1568
1569 dev_hold(dev);
1570 ip6gre_tunnel_link(ign, nt);
1571
1572out:
1573 return err;
1574}
1575
1576static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1577 struct nlattr *data[])
1578{
1579 struct ip6_tnl *t, *nt;
1580 struct net *net = dev_net(dev);
1581 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1582 struct __ip6_tnl_parm p;
1583
1584 if (dev == ign->fb_tunnel_dev)
1585 return -EINVAL;
1586
1587 nt = netdev_priv(dev);
1588 ip6gre_netlink_parms(data, &p);
1589
1590 t = ip6gre_tunnel_locate(net, &p, 0);
1591
1592 if (t) {
1593 if (t->dev != dev)
1594 return -EEXIST;
1595 } else {
1596 t = nt;
1597
1598 ip6gre_tunnel_unlink(ign, t);
1599 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1600 ip6gre_tunnel_link(ign, t);
1601 netdev_state_change(dev);
1602 }
1603
1604 return 0;
1605}
1606
1607static size_t ip6gre_get_size(const struct net_device *dev)
1608{
1609 return
1610 /* IFLA_GRE_LINK */
1611 nla_total_size(4) +
1612 /* IFLA_GRE_IFLAGS */
1613 nla_total_size(2) +
1614 /* IFLA_GRE_OFLAGS */
1615 nla_total_size(2) +
1616 /* IFLA_GRE_IKEY */
1617 nla_total_size(4) +
1618 /* IFLA_GRE_OKEY */
1619 nla_total_size(4) +
1620 /* IFLA_GRE_LOCAL */
a3754133 1621 nla_total_size(sizeof(struct in6_addr)) +
c12b395a 1622 /* IFLA_GRE_REMOTE */
a3754133 1623 nla_total_size(sizeof(struct in6_addr)) +
c12b395a 1624 /* IFLA_GRE_TTL */
1625 nla_total_size(1) +
1626 /* IFLA_GRE_TOS */
1627 nla_total_size(1) +
1628 /* IFLA_GRE_ENCAP_LIMIT */
1629 nla_total_size(1) +
1630 /* IFLA_GRE_FLOWINFO */
1631 nla_total_size(4) +
1632 /* IFLA_GRE_FLAGS */
1633 nla_total_size(4) +
1634 0;
1635}
1636
1637static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1638{
1639 struct ip6_tnl *t = netdev_priv(dev);
1640 struct __ip6_tnl_parm *p = &t->parms;
1641
1642 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1643 nla_put_be16(skb, IFLA_GRE_IFLAGS, p->i_flags) ||
1644 nla_put_be16(skb, IFLA_GRE_OFLAGS, p->o_flags) ||
1645 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1646 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
a3754133
ND		 1647 nla_put(skb, IFLA_GRE_LOCAL, sizeof(struct in6_addr), &p->laddr) ||
1648 nla_put(skb, IFLA_GRE_REMOTE, sizeof(struct in6_addr), &p->raddr) ||
c12b395a 1649 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
1650 /*nla_put_u8(skb, IFLA_GRE_TOS, t->priority) ||*/
1651 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1652 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1653 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags))
1654 goto nla_put_failure;
1655 return 0;
1656
1657nla_put_failure:
1658 return -EMSGSIZE;
1659}
1660
1661static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
1662 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1663 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1664 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1665 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1666 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1667 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
1668 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
1669 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1670 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
1671 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
1672 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1673};
1674
1675static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
1676 .kind = "ip6gre",
1677 .maxtype = IFLA_GRE_MAX,
1678 .policy = ip6gre_policy,
1679 .priv_size = sizeof(struct ip6_tnl),
1680 .setup = ip6gre_tunnel_setup,
1681 .validate = ip6gre_tunnel_validate,
1682 .newlink = ip6gre_newlink,
1683 .changelink = ip6gre_changelink,
1684 .get_size = ip6gre_get_size,
1685 .fill_info = ip6gre_fill_info,
1686};
1687
1688static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
1689 .kind = "ip6gretap",
1690 .maxtype = IFLA_GRE_MAX,
1691 .policy = ip6gre_policy,
1692 .priv_size = sizeof(struct ip6_tnl),
1693 .setup = ip6gre_tap_setup,
1694 .validate = ip6gre_tap_validate,
1695 .newlink = ip6gre_newlink,
1696 .changelink = ip6gre_changelink,
1697 .get_size = ip6gre_get_size,
1698 .fill_info = ip6gre_fill_info,
1699};
1700
1701/*
1702 * And now the modules code and kernel interface.
1703 */
1704
1705static int __init ip6gre_init(void)
1706{
1707 int err;
1708
1709 pr_info("GRE over IPv6 tunneling driver\n");
1710
1711 err = register_pernet_device(&ip6gre_net_ops);
1712 if (err < 0)
1713 return err;
1714
1715 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
1716 if (err < 0) {
1717 pr_info("%s: can't add protocol\n", __func__);
1718 goto add_proto_failed;
1719 }
1720
1721 err = rtnl_link_register(&ip6gre_link_ops);
1722 if (err < 0)
1723 goto rtnl_link_failed;
1724
1725 err = rtnl_link_register(&ip6gre_tap_ops);
1726 if (err < 0)
1727 goto tap_ops_failed;
1728
1729out:
1730 return err;
1731
1732tap_ops_failed:
1733 rtnl_link_unregister(&ip6gre_link_ops);
1734rtnl_link_failed:
1735 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1736add_proto_failed:
1737 unregister_pernet_device(&ip6gre_net_ops);
1738 goto out;
1739}
1740
1741static void __exit ip6gre_fini(void)
1742{
1743 rtnl_link_unregister(&ip6gre_tap_ops);
1744 rtnl_link_unregister(&ip6gre_link_ops);
1745 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1746 unregister_pernet_device(&ip6gre_net_ops);
1747}
1748
1749module_init(ip6gre_init);
1750module_exit(ip6gre_fini);
1751MODULE_LICENSE("GPL");
1752MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1753MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1754MODULE_ALIAS_RTNL_LINK("ip6gre");
1755MODULE_ALIAS_NETDEV("ip6gre0");
Linux 6.x block layer and io_uring tree(s)